modular ： A code set that implements a function with code , Function modularization , Save time , Increase of efficiency

One 、 Module import

The import module , In fact, it is to tell python Interpreter to interpret the corresponding .py file

• Import .py file , The interpreter explains that .py file

• Pour in a bag , The interpreter explains under the package __init__.py file

Import module method ：

 import time

from time import sleep

from time import sleep as sp

from time import *

Path to import module , namely sys.path

 import sys

print(sys.path)
# give the result as follows 

['C:\\Users\\Lenovo\\PycharmProjects\\Ethan\\study_day7', 'C:\\Users\\Lenovo\\PycharmProjects\\Ethan', 'C:\\Python35\\python35.zip', 'C:\\Python35\\DLLs', 'C:\\Python35\\lib', 'C:\\Python35', 'C:\\Python35\\lib\\site-packages']

If you don't have the path you want , Use sys.path.append(' route ') To add

Can pass os Modules get various directories , Such as ：

 import sys

import os
pre_path = os.path.abspath('./')

# print(pre_path)

sys.path.append(pre_path)

Two 、 Module classification
Custom module ： Personal writing , Call in your own code

Built-in module ：python Official supply

Open source module ： Third Party writing , Open source download, install and use

How to download and install ：

 yum

pip

apt-get
 Download the source code 

Decompress the source code 

Entry directory 

Compile source code python setup.py build

Installation source python setup.py install

Method 2

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